TY - CONF AB - We overview the 3-year Meteracom project which will provide traceability to the SI for THz communication measurement parameters. The key objectives are to develop new metrological methods to characterize the measurement systems, system components and propagation channels. The final objective is to develop metrology for functionality and signal integrity of THz communication systems; particularly device discovery and beam tracking, determination of physical layer parameters for digital transmission and real-time performance evaluation. AU - Humphreys, David AU - Berekovic, Mladen AU - Kallfass, Ingmar AU - Scheytt, Christoph AU - Kuerner, Thomas AU - Jukan, Admela AU - Schneider, Thomas AU - Kleine-Ostmann, Thomas AU - Koch, Martin AU - Thomae, Reiner ID - 24053 T2 - Proc. 43-nd Meeting of the Wireless World Research Forum (WWRF)", TI - An overview of the Meteracom Project ER - TY - CONF AB - Targeting the feasible application of microwave RFID systems with MIMO reader technology for tracking small objects in multipath fading conditions, we present a fully integrated Analog Front-End (AFE) designed and fabricated in a standard 65-nm CMOS technology for low power passive RFID tags in the 5.8 GHz ISM band. A differential drive power scavenging unit is dimensioned to provide a 1.2 V rectified voltage resulting in a 1 V regulated voltage for the AFE while supplying a 50 μW load. Transistors with standard threshold voltage (V th ) have been used for implementation. Measurements of the fabricated circuits show a maximum Power Conversion Efficiency (PCE) of 71.8% at -12.5 dBm, and an input quality factor (Q-factor) of approximately 10. AU - Haddadian, Sanaz AU - Scheytt, Christoph ID - 24057 T2 - IEEE International Conference on RFID Technology & Application (RFID-TA) TI - A 5.8 GHz CMOS Analog Front-End Targeting RF Energy Harvesting for Microwave RFIDs with MIMO Reader ER - TY - CONF AB - Embedded systems require a high energy efficiency in combination with an optimized performance. As such, Bit Manipulation Instructions (BMIs) were introduced for x86 and ARMv8 to improve the runtime efficiency and power dissipation of the compiled software for various applications. Though the RISC-V platform is meanwhile widely accepted for embedded systems application, its instruction set architecture (ISA) currently still supports only two basic BMIs.We introduce ten advanced BMIs for the RISC-V ISA and implemented them on Berkeley's Rocket CPU [1], which we synthesized for the Artix-7 FPGA and the TSMC 65nm cell library. Our RISC-V BMI definitions are based on an analysis and combination of existing x86 and ARMv8 BMIs. Our Rocket CPU hardware extensions show that RISC-V BMI extensions have no negative impact on the critical path of the execution pipeline. Our software evaluations show that we can, for example, expect a significant impact for time and power consuming cryptographic applications. AU - Koppelmann, Bastian AU - Adelt, Peer AU - Müller, Wolfgang AU - Scheytt, Christoph ID - 24058 T2 - 29th International Symposium on Power and Timing Modeling, Optimization and Simulation (PATMOS) TI - RISC-V Extensions for Bit Manipulation Instructions ER - TY - CONF AB - We present a complete Visible Light Communication (VLC) system for experimental Vehicular VLC (V-VLC) research activities. Visible light is becoming an important technology complementing existing Radio Frequency (RF) technologies such as Cellular V2X (C-V2X) and Dedicated Short Range Communication (DSRC). In this scope, first works helped introducing new simulation models to explore V-VLC capabilities, technologies, and algorithms. Yet, experimental prototypes are still in an early phase. We aim bridging this gap with our system, which integrates a custom-made driver hardware, commercial vehicle light modules, and an Open Source signal processing implementation in GNU Radio, which explicitly offers rapid prototyping. Our system supports OFDM with a variety of Modulation and Coding Schemes (MCS) and is compliant to IEEE 802.11; this is in line with the upcoming IEEE 802.11 LC standard as well. In an extensive series of experiments, we assessed the communication performance by looking at realistic inter vehicle distances. Our results clearly show that our system supports even higher order MCS with very low error rates over long distances. AU - Amjad, Muhammad Sohaib AU - Tebruegge, Claas AU - Memedi, Agon AU - Kruse, Stephan AU - Kress, Christian AU - Scheytt, Christoph AU - Dressler, Falko ID - 24059 T2 - IEEE International Conference on Communications (ICC) TI - An IEEE 802.11 Compliant SDR-Based System for Vehicular Visible Light Communications ER - TY - CONF AB - In diesem Artikel stellen wir eine Methode zur nicht-invasiven dynamischen Speicher- und IO-Analyse mit QEMU für sicherheitskritische eingebettete Software für die RISC-V Befehlssatzarchitektur vor. Die Implementierung basiert auf einer Erweiterung des Tiny Code Generator (TCG) des quelloffenen CPU-Emulators QEMU um die dynamische Identifikation von Zugriffen auf Datenspeicher sowie auf an die CPU angeschlossene IO-Geräte. Wir demonstrieren die Funktionalität der Methode anhand eines Versuchsaufbaus, bei dem eine Schließsystemkontrolle mittels serieller UART-Schnittstelle an einen RISC-V-Prozessor angebunden ist. Dieses Szenario zeigt, dass ein unberechtigter Zugriff auf die UART-Schnittstelle frühzeitig aufgedeckt und ein Angriff auf eine Zugangskontrolle somit endeckt werden kann. AU - Adelt, Peer AU - Koppelmann, Bastian AU - Müller, Wolfgang AU - Scheytt, Christoph ID - 24060 SN - 978-3-8007-4945-4 T2 - MBMV 2019-22.Workshop Methoden und Beschreibungssprachen zur Modellierung und Verifikation von Schaltungen und Systemen (MBMV 2019) TI - Analyse sicherheitskritischer Software für RISC-V Prozessoren ER - TY - CONF AU - Adelt, Peer AU - Koppelmann, Bastian AU - Müller, Wolfgang AU - Scheytt, Christoph AU - Driessen, Benedikt ID - 24061 T2 - 2nd International Workshop on Embedded Software for Industrial IoT in conjunction with DATE 2019 TI - QEMU for Dynamic Memory Analysis of Security Sensitive Software ER - TY - JOUR AB - It its current Version 3.1.0 QEMU supports RISC-V RV32GC and RV64GC software emulation in user and full system mode. We will first give an overview of the current state of the QEMU RISC-V implementation. Thereafter, we will present the DecodeTree tool, which will be available with the next QEMU release. DecodeTree is a code generator included in QEMU that can generate the program logic for extracting and decoding opcodes and operands from a formal instruction list of the target architecture. This enables the structured implementation of just-in-time compilations to guarantee that the QEMU implementation meets the ISA specification. As such, we completely replaced the existing RISC-V RV32GC and RV64GC implementations by DecodeTree generations in the next official QEMU release, which is expected in spring 2019. We will demonstrate the DecodeTree applications by the example of RISC-V ISA subset configurations. AU - Adelt, Peer AU - Koppelmann, Bastian AU - Müller, Wolfgang AU - Scheytt, Christoph ID - 24063 JF - 2nd International Workshop on RISC-V Research Activities TI - QEMU Support for RISC-V: Current State and Future Releases VL - (Presentation) ER - TY - CHAP AU - Hoyer, Kay-Peter AU - Schaper, Mirko ID - 24097 SN - 2367-1181 T2 - TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings TI - Alloy Design for Biomedical Applications in Additive Manufacturing ER - TY - CHAP AU - Tasche, Lennart AU - Hoyer, Kay-Peter AU - Zhuravlev, Evgeny AU - Grundmeier, Guido AU - Schaper, Mirko AU - Keßler, Olaf ID - 24098 SN - 2367-1181 T2 - TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings TI - Surface Inoculation of Aluminium Powders for Additive Manufacturing Guided by Differential Fast Scanning Calorimetry ER - TY - GEN ED - Eiber, Marion ID - 24102 SN - 2509-8772 TI - Einfluss von Eigenspannungen und Oberflächenrauheit additiv gefertigter Komponenten aus 316L auf die Beschichtbarkeit und Ermüdungsfestigkeit, ER - TY - GEN ED - Azarmi, Fardad ID - 24103 SN - 9781510888005 TI - Adhesion of HVOF sprayed WC-Co coatings on additively processed 316L ER - TY - JOUR AU - Inguva, Venkatesh AU - Graceffa, Rita AU - Schulz, Joachim AU - Bilsel, Osman AU - Perot, Blair J. ID - 24122 JF - Journal of Mechanical Science and Technology SN - 1738-494X TI - Creating round focused micro-jets from rectangular nozzles ER - TY - CONF AU - König, Jonas AU - Malberg, Simon AU - Martens, Martin AU - Niehaus, Sebastian AU - Krohn-Grimberghe, Artus AU - Ramaswamy, Arunselvan ID - 24141 T2 - Science and Information Conference TI - Multi-stage reinforcement learning for object detection ER - TY - JOUR AU - Knoke, Torben AU - Kronberg, Alexander AU - Glushenkov, Maxim AU - Kenig, Eugeny ID - 24272 IS - 5 JF - Applied Thermal Engineering SN - 1359-4311 TI - On the design of heat exchanger equipment for novel-type isobaric expansion engines VL - 167 ER - TY - CONF AU - Malatyali, Hatice AU - Schöppner, Volker ID - 24319 T2 - 27. Fachtagung Technomer TI - Untersuchung des Dosierverhaltens von Carbonfaserrezyklaten für den Einsatz im gleichläufigen Doppel-schneckenextruder ER - TY - CONF AU - Malatyali, Hatice AU - Schöppner, Volker AU - Tillmann, Wolfgang AU - Kokalj, David ID - 24322 T2 - SPE ANTEC TI - Deveploment of thin film sensors: The influence of layer variation on the measurement quality for inline melt temperature measurements ER - TY - CONF AU - Vogtschmidt, Sascha AU - Schöppner, Volker ID - 24326 TI - Vibration welding of components with angled areas in the direction of vibration ER - TY - CONF AB - Liquid atomization is expected to be a key process in Flame Spray Pyrolysis, as it determines the primary droplet size and velocity distribution, which represent initial conditions for flame shape and temperature field. A well-defined manipulation of atomization may be achieved by variation of nozzle geometry, injection parameter or fluid properties. However, change of fluid properties, e.g. varying solvents or increasing the precursor concentration, also influences the final particle properties. In this work, the influence of precursor concentration on fluid properties, spray and particle formation in Flame Spray Pyrolysis is experimentally investigated. High-speed shadowgraphy and Phase-Doppler measurements are conducted in a semi-closed combustion chamber with a well-defined burner geometry (SpraySyn burner) that is based on a coaxial atomization principle. By adding precursor to the flammable solvent, resulting spray characteristics, flame shape and appearance are changed in color, shape and mean droplet size distribution. Compared to resulting mean droplet sizes of pure solvent mixtures (D32, 22 μm), mean droplet sizes in the center of the precursor flame at 30 mm above the burner are generally smaller (D32, 18 μm). Persisting high share of small droplets in the droplet size distribution are presented, that presumably origin from an accumulation of metal organic precursor at the droplet surface during combustion, that acts as a diffusive barrier for high volatility solvent and thus reduces droplet evaporation. Sufficiently high above the nozzle exit, increasing the precursor concentration does not affect the radial distribution of mean droplet sizes but leads to increased mean particle sizes. More precursor presumably leads to higher concentrations of prime particles in the flame, thus probability of particle collusion and agglomeration. High-speed imaging at nozzle exit revealed random fluctuations of initial jet diameter, paired with jet axis shifting around 1000 Hz. These superposed fluctuations determine the initial conditions for atomization, induce pulsations in the flame and thus initiate the entire chain of the particle synthesis process. AU - Bieber, M. AU - Tischendorf, R. AU - Reddemann, M. AU - Schmid, H.-J. AU - Kneer, R. ID - 24502 KW - FSP KW - nanoparticle synthesis KW - in situ measurements TI - Influence of precursor concentration on spray and particle formation in flame spray pyrolysis ER - TY - GEN AU - Menge, Dennis AU - Walter, Rolf AU - Schmid, Hans-Joachim AU - Breuer, Ulf Paul ID - 24628 TI - FVA-Nr. 813 I - Generative Verfahren zur Herstellung von Polymerbauteilen VL - 1338 ER - TY - JOUR AB - Prerequisite for an efficient cooling energy system is the knowledge and optimal combination of different operating conditions of individual compression and free cooling chillers. The performance of cooling systems depends on their part-load performance and their condensing temperature, which are often not continuously measured. Recorded energy data remain unused, and manufacturers’ data differ from the real performance. For this purpose, manufacturer and real data are combined and continuously adapted to form part-load chiller models. This study applied a predictive optimization algorithm to calculate the optimal operating conditions of multiple chillers. A sprinkler tank offers the opportunity to store cold-water for later utilization. This potential is used to show the load shifting potential of the cooling system by using a variable electricity price as an input variable to the optimization. The set points from the optimization have been continuously adjusted throughout a dynamic simulation. A case study of a plastic processing company evaluates different scenarios against the status quo. Applying an optimal chiller sequencing and charging strategy of a sprinkler tank leads to electrical energy savings of up to 43%. Purchasing electricity on the EPEX SPOT market leads to additional costs savings of up to 17%. The total energy savings highly depend on the weather conditions and the prediction horizon. AU - Peesel, Ron-Hendrik AU - Schlosser, Florian AU - Meschede, Henning AU - Dunkelberg, Heiko AU - Walmsley, Timothy ID - 24632 JF - Energies SN - 1996-1073 TI - Optimization of Cooling Utility System with Continuous Self-Learning Performance Models ER -